(1) Excessive or insufficient temperature of the machine head or core mold leads to a rough outer surface; low core mold temperature and low machine body temperature can easily cause a rough inner surface.
(2) The cooling water temperature is too high and the surface is rough; reduce the cooling water temperature to the optimal PP-R cooling water temperature of 20-30℃.
(3) Inspect the plumbing for blockages and insufficient water pressure.
(4) Inspect the heating coil for any damage.
(5) Adjust the fixed-diameter water curtain.
(6) Inspect raw material properties and consult with raw material suppliers.
(7) Clean the core temperature, and if it exceeds the temperature of the mouth mold section, activate the core temperature adjustment device.
(8) Inspect and clean the mold for any debris or contaminants.
2. Grooves appear on the outer surface.(1) Inspect and adjust the water discharge of the fixed-diameter water curtain, ensuring balanced pressure.
(2) Adjust the spray nozzle angle to ensure uniform cooling of the pipe material.
(3) Inspect dies, cutting tools, and other items for debris and burrs.
3. Grooves appear on the inner surface.(1) Inspect the inner pipe for water ingress. If water is detected, firmly grasp the newly removed pipe to seal its inner opening.
(2) Reduce the temperature inside the mold.
(3) Clean and polish the mold.
4. Pores appear on the surface of the pipe material.(1) Adjust the fixed-diameter water curtain to ensure even water discharge.
(2) Adjust the vacuum levels in both chambers, ensuring that the vacuum in the rear chamber is slightly greater than that in the front chamber.
(3) Check if the vacuum chamber sealing pads are too tight; adjust as needed.
(4) Inspect the winch for any excessive vibration.
(5) Inspect the extrusion process to ensure uniformity; adjust the machine's speed.
(6) High core mold temperature can easily cause internal surface pores. Ventilate and cool the mold internally.
5. No vacuum(1) Check if the vacuum pump inlet is blocked; if so, clear it using a pointed object.
(2) Verify that the vacuum pump is functioning correctly.
(3) Inspect vacuum lines for leaks.
(4) Check if the small holes in the center of the core mold's fastening screws are blocked. If they are, clear them with a thin wire.
6. The outer diameter of the pipe is too large or too small.(1) Vacuum is too high or too low; adjust the vacuum.
(2) The inner diameter of the mold is too large or too small; select the appropriate mold.
(3) Adjust the pulling speed to be too fast or too slow; adjust the pulling speed.
(4) Water temperature is too high.
(5) Utilize different raw materials or adjust colors; adjust temperature, vacuum, and other processes according to the properties of the raw materials.
7. The pipe's eccentricity is large.(1) The spray cooling is uneven. Adjust the angle of the spray nozzles to ensure uniform cooling of the pipe material.
(2) Check water level, pressure gauge readings, to ensure adequate and forceful spray output.
(3) Inspect water temperature; if it exceeds 35°C, a chilled water system or additional spray cooling units must be installed.
(4) Inspect water lines, clean filters, etc.
(5) Adjust the machine head to ensure even material discharge.
(6) Inspect and correct the roundness of the inner hole within the fixed-diameter sleeve.
(7) If using immersion cooling, the water level in the water tank should exceed the surface of the pipe material to prevent uneven cooling. Immersion cooling is generally not recommended for large pipe materials.
8. Uneven wall thickness of pipes.(1) Adjust the mold bolts to the appropriate tightness to ensure uniform material discharge from the mold.
(2) Adjust the angle of the spray nozzles to ensure uniform cooling of the pipe material.
(3) Adjust the fixed-diameter water curtain to ensure even water discharge.
(4) Remove the mold and inspect the internal hex screws to ensure they are properly tightened. If any are loose, they must be re-tightened.
9、Pipes cut to excessively long or short lengths.(1) Inspect the operating mechanism of the cutting machine for damage.
(2) Check if the receiving platform has shifted, and adjust it immediately.
(3) If the cutting is performed using a counting wheel, check if the counting wheel is properly tightened and if the rollers are not too loose.
(4) Cutting machine malfunction, resulting in either no cutting or improper cutting.
(5) Check the air pressure of the cutting machine to ensure it is stable, and adjust the pressure accordingly.
10. Color lines are too wide.(1) This is often due to the use of different materials between the color-matching material and the pipe material. It is recommended to use materials of the same specification.
(2) The color extrusion machine temperature is too high, resulting in rapid dispersion; the temperature in the color extrusion section should be lowered.
(3) The color line machine's speed is too high, resulting in excessive extrusion of the color line material.
11、Color variations may appear intermittently or not at all.(1) The color extrusion machine temperature is too low or the color extrusion material pathway is blocked, preventing the color extrusion material from being extruded. Increase the temperature or clear the material pathway.
(2) Uneven material discharge from the discharge port. Check the drainage status of the discharge water and the size of the material particles.
(3) Screw breakage, preventing material from being extruded; inspect the screw.
12. Operating System Failure(1) Verify that the electrical connections are intact.
(2) Computer system malfunction, contact maintenance personnel.
13、Pipe surface patterns(1) The temperature around the mold is too high, causing low molecular substances to precipitate and stick to the mold.
(2) The setting compound contains debris and requires cleaning.
(3) The colored materials that were previously used and attached to the machine head mold were not cleaned properly.
(4) Connection and head temperature are low, resulting in poor material plasticity.
14、Unevenness on pipe walls(1) The outer mold and inner mold centers are not aligned.
(2) Uneven temperature at the head of the machine, resulting in inconsistent extrusion speed.
(3) Improper traction, causing slippage (due to either too large or too small diameter).
(4) The material contains impurities.
15、Bending of pipes(1) Uneven pipe wall thickness.
(2) The temperature around the head of the machine is uneven, resulting in inconsistent extrusion.
(3) The central components, such as the spindle, cooling channels, and traction mechanisms, are not aligned on the same horizontal plane.
(4) When using water bath cooling, the water level does not exceed the upper surface of the pipe.
16、The surface has bubbles.(1) The raw material contains too much moisture; it needs to be dried.
(2) The raw materials contain many substances that decompose easily.
17、The wall thickness of the pipe varies along its length.(1) The towing suddenly accelerated, and the main machine could not keep up.
(2) Poor adhesion.
18、Wall thickness varies, sometimes thick, sometimes thin.(1) Inconsistent material output when using different specifications of scrap material.
(2) Poor adhesion stability.